Kharchenko, N. V.; Piskunov, A. E.; Schilbach, E.; Röser, S.; Scholz, R.-D. (2013). «Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters». Astronomy & Astrophysics558: A53. doi:10.1051/0004-6361/201322302. Bibcode: 2013A&A...558A..53K.
Dufton, P. L.; Smartt, S. J.; Lee, J. K.; Ryans, R. S. I.; Hunter, I.; Evans, C. J.; Herrero, A.; Trundle, C. και άλλοι. (2006). «The VLT-FLAMES survey of massive stars: Stellar parameters and rotational velocities in NGC 3293, NGC 4755 and NGC 6611». Astronomy and Astrophysics457: 265. doi:10.1051/0004-6361:20065392. Bibcode: 2006A&A...457..265D.
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Kharchenko, N. V.; Piskunov, A. E.; Schilbach, E.; Röser, S.; Scholz, R.-D. (2013). «Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters». Astronomy & Astrophysics558: A53. doi:10.1051/0004-6361/201322302. Bibcode: 2013A&A...558A..53K.
Dufton, P. L.; Smartt, S. J.; Lee, J. K.; Ryans, R. S. I.; Hunter, I.; Evans, C. J.; Herrero, A.; Trundle, C. και άλλοι. (2006). «The VLT-FLAMES survey of massive stars: Stellar parameters and rotational velocities in NGC 3293, NGC 4755 and NGC 6611». Astronomy and Astrophysics457: 265. doi:10.1051/0004-6361:20065392. Bibcode: 2006A&A...457..265D.